This air pump was well packaged with easy to find instructions on the box. Easy to set up in my 150 gallon tank but it didn't move as much air as my other air pumps which are also 150 gallons. It's adjustable, so works with my small tanks, but overpriced for larger tanks. That's why I gave 3 stars. But a good, quiet pump for smaller aquariums. EDIT: Added star. Have had a 40 gallon machine installed with new air vents and hoses for a while and it works fine. I have a full fit so I'd say that's probably the limit for this pump. Very quiet.
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